[J pold]

Originally Posted by evman150

They mean 1.5x the radius.

Since the acceleration due to gravity is proportional to r^-2, this results in a value of g of 4g[earth]/9. But it is also proportional to the mass, in this case estimated to be 5 earth masses. So we get a final value for the acceleration due to gravity of 20*g[earth]/9, or about 21.8 ms^-2.

This also answers Cowperson's assertion. How fast an object is spinning is inconsequential.

Are you trying to show us how smart you are? Or just trying to convince yourself?